> The group I work in has been experimenting with GFS and Lustre, and I did > some NBD/ENBD experimentation on my own, described at > http://dcs.nac.uci.edu/~strombrg/nbd.html > > My question is, what is the current status of huge filesystems - IE, > filesystems that exceed 2 terabytes, and hopefully also exceeding 16 > terabytes? > > Am I correct in assuming that the usual linux buffer cache only goes to 16 > terabytes?
The page cache limit is PAGE_CACHE_BITS + BITS_PER_LONG - 1. On i386 that's 12 + 32 - 1 = 43 bits or 8Tbytes. On 64 bit architectures the size of off_t is the only limit. > Does the FUSE API (or similar) happen to allow surpassing either the 2T or > 16T limits? The API certainly doesn't have any limits. The page cache limit holds for FUSE too, though with the direct-io mount option the page cache is not used, so the limit could be removed as well. I'll fix that. Thanks, Miklos - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
